JP7398313B2 - casting equipment - Google Patents

Description

The present invention relates to a casting device for obtaining cylinder blocks.

2. Description of the Related Art As a type of internal combustion engine for automobiles, a so-called V-shaped engine is known, in which a plurality of cylinder bores formed in a cylinder block are adjacent to each other in a V-shape. Further, a water jacket, which is a passage for cooling water, is generally formed around the cylinder bore. A cylinder block in which such a cylinder bore and a water jacket are formed can be obtained by casting using a casting apparatus as described in Patent Document 1, for example.

In this case, the casting apparatus includes a fixed mold that is positioned and fixed, a movable mold that approaches or moves away from the fixed mold, a bore forming core for forming the cylinder bore, and a water cylinder for forming the water jacket. A core for forming a jacket is provided. A cavity is formed by the fixed mold and the movable mold. Further, the core for forming the bore and the core for forming the water jacket are provided on a movable platen that supports the movable mold.

As described in Patent Document 2, the water jacket forming core is provided so as to surround the outer peripheral side of the bore forming core. Here, the movable platen supports an actuator that integrally displaces the bore forming core and the water jacket forming core. The actuator is disposed at a position farther from the cavity than the bore-forming core and the water jacket-forming core, and advances both cores toward the cavity while retracting them from the cavity. In other words, the core for forming the bore and the core for forming the water jacket integrally approach or separate from the cavity under the action of the actuator.

When casting, prior to closing the mold, a mold release material is applied (for example, spray coating) to the fixed mold, the movable mold, the core for forming the bore, and the core for forming the water jacket. It is assumed that the mold release material scattered into the atmosphere at this time enters the casting apparatus through the gap between the movable platen and the actuator, and then goes around to the bore forming core side. When the mold release material enters the cavity from the bore forming core, the mold release material in the cavity becomes excessive.

In order to avoid this, in the technique described in Patent Document 1, a flow passage for compressed air is formed in the bore forming core (the "bore pin" in Patent Document 1), and air is blown in the open state of the mold to release the mold release material. By blowing away, the mold release material is prevented from passing along the bore forming core and entering the cavity. Alternatively, instead of air blowing, an O-ring can be installed in a part of the bore forming core that is not buried in the molten metal filled in the cavity to seal between the bore forming core and the water jacket forming core. It is being done.

Utility model registration No. 2510455 Japanese Patent Application Publication No. 8-132210

While the cavity is being filled with molten metal, most of the gas within the cavity is exhausted to the atmosphere through a vent hole formed in the casting apparatus. However, it is not easy for gas existing in the gap between the bore forming core and the water jacket forming core to circulate into the vent hole. Therefore, gas is drawn into the gasket surface near the opening of the cylinder bore. If the amount of gas entrained is excessively large, casting defects such as blowholes are likely to be formed, resulting in a decrease in the quality of the cylinder block.

The present invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide a casting device that can avoid gas being entangled in the molten metal, and thus can obtain a cylinder block of good quality. purpose.

In order to achieve the above object, an embodiment of the present invention includes a fixed mold and a movable mold that approaches or moves away from the fixed mold, and the fixed mold and the movable mold move the cylinder block. In a casting device that forms a cavity for obtaining
a bore forming core for forming a cylinder bore in the cylinder block;
a water jacket forming core that surrounds the bore forming core from the outer peripheral side and forms a water jacket around the cylinder bore;
an actuator that integrally displaces the bore forming core and the water jacket forming core in a direction toward or away from the cavity;
Disposed in a gap between the bore forming core and the water jacket forming core, dividing the gap into a proximal side portion that is close to the cavity and a remote side portion that is spaced apart from the cavity. a seal member;
a suction device that sucks gas from the proximal portion through a flow path formed in the bore forming core;
Equipped with
The bore forming core has a proximal part facing the proximal side part and always exposed from the molten metal in the cavity, a distal part facing the remote side part, and a direction from the proximal part toward the cavity. a bore forming part that protrudes and is buried in the molten metal in the cavity,
the flow path has a first opening formed on the outer surface of the proximal portion and a second opening formed on the outer surface of the distal portion and connected to the suction device; A casting device is provided that is located above an imaginary axis that passes through the center of the bore forming core and extends along the longitudinal direction of the bore forming core when the core is viewed from the side.

According to the present invention, when filling a cavity with molten metal, the flow passage formed at a predetermined location of the bore forming core exists in the gap between the bore forming core and the water jacket forming core. Gas can be removed from the gap. This prevents gas from being drawn into the molten metal, making it difficult for casting defects to occur in the cylinder block, which is a cast product. In other words, the quality of the cylinder block is improved.

FIG. 1 is a schematic vertical cross-sectional view of a casting apparatus according to an embodiment of the present invention when the mold is in an open state. FIG. 2 is a schematic longitudinal cross-sectional view of the casting apparatus in a closed mold state. FIG. 2 is a schematic side sectional view along the longitudinal direction of a core for forming a bore and a core for forming a water jacket, which constitute the casting device. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. 4 is a sectional view taken along the line VV in FIG. 3. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a casting apparatus according to the present invention will be described in detail with reference to the accompanying drawings. Note that "front" in the following refers to the side that is close to the cavity 22 shown in FIG. 2. Moreover, "rear" refers to the opposite direction to "front", that is, the side away from the cavity 22.

1 and 2 are schematic vertical cross-sectional views of main parts when the casting apparatus 10 according to the present embodiment is in a mold open state and a mold closed state, respectively. This casting apparatus 10 includes a fixed platen 14 provided with a fixed mold 12 and a movable platen 18 provided with a movable mold 16. The movable platen 18 can move toward or away from the fixed platen 14 under the action of the opening/closing cylinder 20. When the movable platen 18 approaches or separates from the fixed platen 14, the movable mold 16 approaches or separates from the fixed mold 12.

A cavity 22 shown in FIG. 2 is formed by the fixed mold 12 and the movable mold 16 in the closed mold state. In this embodiment, the cavity 22 is for molding a cylinder block that constitutes a six-cylinder V-type internal combustion engine. Incidentally, a vent hole (not shown) is formed in at least one of the movable platen 18 and the fixed platen 14 for exhausting the gas in the cavity 22 to the atmosphere when the cavity 22 is filled with molten metal. Ru. Furthermore, an ejector pin (not shown) is provided on the fixed platen 14 so as to be exposed to or retracted from the cavity 22 .

A first sliding groove 24 and a second sliding groove 26 are formed in the movable platen 18 so as to extend radially from the movable die 16 . The first sliding groove 24 and the second sliding groove 26 are continuous to form a reclining V-shape. Three first sliding grooves 24 and three second sliding grooves 26 are formed in parallel along the direction perpendicular to the paper plane of FIGS. 1 and 2. In addition, in FIG. 1 and FIG. 2, one each of the three first sliding grooves 24 and the three second sliding grooves 26 is shown.

A bore pin displacement cylinder 30 (actuator) is accommodated in the first sliding groove 24 . A core holder 32 that slides along the first sliding groove 24 is connected to the rod that constitutes the bore pin displacement cylinder 30 . As shown in FIG. 3, a bore pin 34 serving as a core for forming a bore is provided at the front end of the core holder 32 facing the cavity 22. The bore pin 34 has a bore forming part 36, a proximal part 38, and a distal part 40 in this order from the front end side close to the cavity 22 to the rear end side. In this case, the diameters of the bore forming portion 36, the proximal portion 38, and the distal portion 40 are different from each other. Specifically, the bore forming portion 36 has a small diameter, the distal portion 40 has a large diameter, and the proximal portion 38 has a slightly smaller diameter than the distal portion 40.

The bore forming portion 36 protruding from the proximal portion 38 toward the cavity 22 is a portion that is buried in the molten metal when the cavity 22 is filled with molten metal. A cylinder bore is formed by separating the bore forming portion 36 from the molten metal whose fluidity has been lost to some extent. In contrast, the proximal portion 38 and the distal portion 40 are always exposed from the molten metal within the cavity 22. That is, the proximal portion 38 and the distal portion 40 do not participate in forming the cylinder bore.

The inner diameter of the water jacket forming core 42 is set to be larger at a portion facing the bore forming portion 36 and the proximal portion 38, and smaller at a portion facing the distal portion 40. The respective side peripheral walls (side walls) of the bore forming part 36 and the proximal part 38 are spaced apart from the inner peripheral wall (inner wall) of the water jacket forming core 42 over the entire circumference. Therefore, a gap 44 is formed between the bore forming part 36 and the proximal part 38 of the bore pin 34 and the water jacket forming core 42. Note that hereinafter, the water jacket forming core may be referred to as "WJ core".

As shown in FIGS. 3 and 5, the lower part of the side peripheral wall (lower part of the side wall) of the distal portion 40 having the largest diameter abuts the lower part of the inner peripheral wall (lower part of the inner wall) of the WJ core 42. This contact causes the bore pin 34 to be supported by the WJ core 42, thereby positioning the bore pin 34. On the other hand, the upper part of the side peripheral wall (upper part of the side wall) of the distal part 40 is separated from the upper part of the inner peripheral wall (upper part of the inner wall) of the WJ core 42, as shown in FIG. That is, the lower part of the gap 44 is slightly closed by the lower part of the distal part 40, and the lateral and upper parts are narrowed by the lateral parts and the upper part of the distal part 40.

A first annular groove 46 and a second annular groove 48 are formed in the side peripheral wall of the distal portion 40 along the circumferential direction. A first O-ring 50 and a second O-ring 52 as sealing members are attached to the first annular groove 46 and the second annular groove 48 . The first O-ring 50 and the second O-ring 52 seal between the side peripheral wall of the distal portion 40 of the bore pin 34 and the inner peripheral wall of the WJ core 42.

A plurality of (for example, two) flow passages 56 are formed inside the bore pin 34 . The individual flow passages 56 include an inner hole 58 that extends linearly from the rear end surface of the distal portion 40 of the bore pin 34 facing the core holder 32 toward the proximal portion 38, and a side of the proximal portion 38. and a ramp 60 that slopes toward the top of the peripheral wall (see especially FIG. 3). The ramp 60 slopes from the distal portion 40 (rear end) toward the proximal portion 38 (front end) and opens at the side peripheral wall of the proximal portion 38 . In this way, the flow path 56 includes a first opening 62 located on the side peripheral wall of the proximal portion 38 (see especially FIG. 4) and a second opening 64 located on the rear end surface of the distal portion 40 (see FIG. 3). and has. Note that the first opening 62 is formed in the vicinity of the first O-ring 50 and at a position in front of the first O-ring 50 closer to the bore forming portion 36 .

FIG. 3 shows a virtual axis X that divides the bore pin 34 into two in the height direction. This virtual axis X passes through the center of the bore pin 34 and extends along the longitudinal direction of the bore pin 34 when the bore pin 34 is viewed from the side. The entire flow path 56, including the first opening 62 and the second opening 64, is located above the virtual axis X.

The rear end of the WJ core 42 is fitted into a fitting recess 70 formed at the front end of the core holder 32. The WJ core 42 is supported by the core holder 32 by this fitting and, if necessary, the WJ core 42 is connected to the core holder 32 via bolts or the like. In this way, both the bore pin 34 and the WJ core 42 are supported by the core holder 32. Therefore, as the rod constituting the bore pin displacement cylinder 30 moves forward and backward, the bore pin 34 and the WJ core 42 are integrally displaced together with the core holder 32.

The WJ core 42 has a substantially cylindrical shape and surrounds the bore pin 34 from the outer peripheral side. The WJ core 42 is shorter than the bore pin 34, and therefore, a portion of the bore forming portion 36 of the bore pin 34 is exposed from the front end of the WJ core 42. As described above, a gap 44 is formed between the inner circumferential wall of the WJ core 42 and the side circumferential wall of the bore pin 34. This gap 44 is divided into a proximal side portion 72 that is close to the cavity 22 side and a remote side portion 74 that is spaced apart from the cavity 22 with the first O-ring 50 and the second O-ring 52 as boundaries.

Since the first O-ring 50 and the second O-ring 52 are provided at the distal portion 40 of the bore pin 34, the proximal portion 72 of the gap 44 faces the proximal portion 38 and the bore forming portion 36, while the distant portion 74 faces the distal portion 40. Further, since the first opening 62 of the flow path 56 is formed in the proximal portion 38 and the second opening 64 is formed in the distal portion 40, the flow path 56 is formed from the proximal portion 72 to the remote portion 74. extending over

Returning to FIGS. 1 and 2, the second sliding groove 26 is also provided with the same structure as the first sliding groove 24. Therefore, the same reference numerals are given to the same components as those already described, and detailed explanation thereof will be omitted.

In this embodiment, the bore pins 34 that are vertically adjacent to each other (or face each other) are inclined so as to form a lying V-shape. That is, the lower bore pin 34 is inclined so that its front end is at a higher position than its rear end, while the upper bore pin 34 is inclined so that its rear end is at a higher position than its front end. ing. Note that three of the lower and upper bore pins 34 are arranged in parallel along the direction perpendicular to the paper plane of FIGS. 1 and 2, respectively.

Both the lower and upper bore pins 34 are influenced by gravity, so that the front end faces upward and the rear end faces downward with respect to the extending direction of the first annular groove 46 and the second annular groove 48. It becomes a tilted posture. Therefore, as described above, the lower part of the side peripheral wall of the distal portion 40 of the bore pin 34 comes into contact with the lower part of the inner peripheral wall of the WJ core 42. Furthermore, as shown in FIG. 4, the gap 44 between the side circumferential wall of the proximal portion 38 of the bore pin 34 and the inner circumferential wall of the WJ core 42 is small at the bottom and large at the top. That is, the separation distance D1 on the lower side is smaller than the separation distance D2 on the upper side.

The separation distance D2 between the upper part of the side peripheral wall of the proximal part 38 and the upper part of the inner peripheral wall of the proximal part 72 of the WJ core 42 is set to 50 μm or less. Note that by positioning the bore pin 34 by bringing the lower part of the side peripheral wall of the distal portion 40 into contact with the lower part of the inner peripheral wall of the WJ core 42, the separation distance D2 can be set accurately to 50 μm or less. Thereby, the upper part of the side peripheral wall of the proximal part 38 of the bore pin 34 and the upper part of the inner peripheral wall of the proximal part 72 of the WJ core 42 are sufficiently separated.

A front end of a flow pipe 76 is connected to each flow path 56 of the bore pin 34 via a second opening 64. The rear end of the flow pipe 76 is focused on a switching valve 78 . This switching valve 78 allows all of the flow pipes 76 to selectively communicate with either the exhaust pipe 80 or the air supply pipe 82 at the same time. Here, the exhaust pipe 80 is connected to an intake pump 84 as a suction machine. Further, the air supply pipe 82 is connected to a compressor 86 (fluid supply machine) that supplies compressed air as blow fluid. Therefore, it is possible to suck the gas in the gap 44 under the action of the suction pump 84, and it is also possible to supply compressed air to the gap 44 under the action of the compressor 86.

The casting apparatus 10 according to the present embodiment is basically configured as described above, and its effects will be explained next in relation to the operation of the casting apparatus 10. Note that the following operations are basically performed by the sequence control action of a control device (not shown).

Prior to the casting operation, a mold release agent is applied to the fixed mold 12, movable mold 16, bore pin 34, WJ core 42, etc. in the open state shown in FIG. This coating is performed, for example, by spray coating, in which the mold release material is applied from a coating gun provided on the tip arm of a robot (not shown). A part of the mold release material is dispersed into the atmosphere in the form of mist, and then adheres to the casting apparatus 10.

Then, the mold is closed to carry out the casting operation. That is, the bore pin displacement cylinder 30 is energized, whereby the bore pin 34 and the WJ core 42 are displaced in a direction toward the movable mold 16 together with the core holder 32. The intake pump 84 may be energized when the bore pin displacement cylinder 30 is energized. At this time, the flow path 56 communicates with the exhaust pipe 80 via the flow pipe 76 and the switching valve 78.

Next, as the opening/closing cylinder 20 is energized, the movable platen 18 approaches the fixed platen 14 . As a result, as shown in FIG. 2, the movable mold 16 and the fixed mold 12 are brought together to form a cavity 22. Here, there is a possibility that the part of the mold release material that has adhered to the casting apparatus 10 may enter the movable platen 18 and travel along the core holder 32 and the bore pin 34 to the cavity 22 side. However, in such a case, the second O-ring 52 dams up the mold release material. Therefore, the release material is inhibited from advancing forward beyond the distal portion 40 of the bore pin 34. For this reason, the amount of mold release material in the cavity 22 is prevented from becoming excessive.

After the cavity 22 is formed, the cavity 22 is filled with molten metal. During filling with molten metal, most of the gas within the cavity 22 is exhausted to the atmosphere outside the cavity 22 through the vent hole.

Further, the gas existing in the gap 44 between the proximal portion 38 and the bore forming portion 36 of the bore pin 34 and the WJ core 42 opens the first opening 62 of the flow path 56 under the action of the suction pump 84. through which it is attracted to the ramp 60. Here, as described above, the separation distance D2 between the upper part of the side peripheral wall of the bore pin 34 and the upper part of the inner peripheral wall of the WJ core 42 is the distance between the lower part of the side peripheral wall of the bore pin 34 and the lower part of the inner peripheral wall of the WJ core 42. It is larger than the distance D1. The flow passage 56 is formed above the imaginary axis X of the bore pin 34, so that it is biased toward the upper side of the bore pin 34. Therefore, in the vicinity of the first opening 62, the upper part of the side peripheral wall of the proximal part 38 of the bore pin 34 and the upper part of the inner peripheral wall of the proximal part 72 of the WJ core 42 are sufficiently separated. Therefore, the gas present in the gap 44 is easily sucked.

The gas flows through the ramp 60, the second opening 64 of the inner bore 58, the flow pipe 76, the exhaust pipe 80, and is exhausted to the atmosphere via the intake pump 84. In this embodiment, the first opening 62 of the flow path 56 is formed near the first seal member. Therefore, the gas present in the gap 44 smoothly flows in the direction away from the cavity 22, so that generation of gas vortices in the gap 44 is suppressed. Therefore, gas can be efficiently removed from the gap 44.

Moreover, in this embodiment, the separation distance D2 between the upper part of the side peripheral wall of the proximal portion 38 of the bore pin 34 and the upper part of the inner peripheral wall on the proximal side of the WJ core 42 is set to 50 μm or less. Moreover, the separation distance D1 between the lower part of the side circumferential wall of the proximal portion 38 of the bore pin 34 and the lower part of the inner circumferential wall on the proximal side of the WJ core 42 is smaller than the separation distance D2. Therefore, it becomes difficult for powder burrs to enter the gap 44. That is, the gap 44 and the first opening 62 are unlikely to be blocked by powder burrs. Therefore, it becomes possible to continuously suck the gas present in the gap 44.

For the reasons described above, it is possible to avoid a large amount of gas being drawn into the portion of the molten metal that will become the gasket surface, the cylinder bore, and the like. Therefore, the occurrence of casting defects such as blowholes in the cylinder block is suppressed, so that a cylinder block of excellent quality can be obtained.

After a predetermined period of time has elapsed after the filling of the molten metal is completed, for example, after the molten metal has solidified to such an extent that it loses its fluidity, the opening/closing cylinder 20 is energized. That is, the movable platen 18 and the movable mold 16 are displaced away from the fixed platen 14 and the fixed mold 12, thereby opening the mold. As a result, the casting apparatus 10 returns to the state shown in FIG. 1, and the cylinder block is exposed. The cylinder block is attached to a fixed mold 12.

When the opening/closing cylinder 20 is energized, the switching valve 78 is actuated, and communication (connection) between the flow pipe 76 and the exhaust pipe 80 is cut off, and communication (connection) between the flow pipe 76 and the air supply pipe 82 is established. be done. Note that the compressor 86 is energized prior to this switching. For example, the compressor 86 may be energized from the time the mold starts closing.

Therefore, compressed air from the compressor 86 flows through the air supply pipe 82 and the flow pipe 76 to the second opening 64 of the flow passage 56 (inner hole 58). Compressed air is further discharged from the first opening 62 of the ramp 60 towards the gap 44 . That is, so-called air blowing is started. Even if powder burrs have entered the gap 44, the powder burrs are discharged from the gap 44 by this air blow. Further, at this point, the bore pin 34 has not been removed from the cylinder block, so the compressed air comes into contact with the cylinder block. Therefore, the cylinder block is efficiently cooled.

Next, as the bore pin displacement cylinder 30 is energized, the bore pin 34 and the WJ core 42 are displaced in a direction away from the movable mold 16 together with the core holder 32 . Further, the ejector pin provided on the fixed platen 14 is displaced so as to be exposed from the cavity 22, and the cylinder block is pushed out from the fixed mold 12. As a result, the cylinder block is released from the mold. Therefore, the compressed air discharged from the first opening 62 contacts not only the bore pin 34 and the WJ core 42 but also the movable mold 16 and the fixed mold 12. Therefore, the movable mold 16 and the fixed mold 12 can be efficiently cooled.

Further, if mold release material, cast pieces, etc. remain on the bore pin 34, the WJ core 42, the movable mold 16, and the fixed mold 12, these are blown away with compressed air. That is, the casting apparatus 10 is cleaned by compressed air. Therefore, there is no need to separately perform cleaning work. In combination with the above, it is possible to shorten the cycle time from the start of applying the mold release material to the end of the cleaning work.

Here, the ramp 60 is inclined from the distal portion 40 side (rear end) toward the proximal portion 38 side (front end). Therefore, the powder burrs, mold release material, cast pieces, etc. are pressed by the compressed air in a direction further forward than the first opening 62 . This prevents the first opening 62 from being blocked by powder burrs, mold release material, cast pieces, etc. Therefore, air blowing can be performed continuously for a long time.

The present invention is not particularly limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.

For example, the casting apparatus 10 may be arranged so that adjacent (opposing) bore pins 34 form a V-shape in an upright position. Further, the casting apparatus 10 may be used to obtain a so-called in-line internal combustion engine in which a plurality of cylinder bores are arranged in parallel in a straight line.

Furthermore, if a flow path 56 located above the virtual axis X is formed, in addition to this flow path 56, another flow path located below the virtual axis X is formed. It's okay.

Furthermore, although not particularly shown, the bore pin 34 may be covered with a cylinder sleeve.

In this embodiment, the first O-ring 50 and the second O-ring 52 are used as seal members, but the number of seal members may be one , or three or more. In the case of three or more seal members, the first opening 62 may be formed in front of the frontmost seal member. In this case, the gap 44 is divided into a proximate side portion 72 that is forward of the frontmost seal member and a separated side portion 74 that is rearward of the rearmost seal member.

DESCRIPTION OF SYMBOLS 10... Casting device 12... Fixed mold 16... Movable mold 20... Opening/closing cylinder 22... Cavity 30... Bore pin displacement cylinder 32... Core holder 34... Bore pin 36... Bore forming part 38... Proximal part 40... Distal part 42...Water jacket forming core 44...Gap 50, 52...O ring 56...Flow path 58...Inner hole 60...Ramp 62...First opening 64...Second opening 72...Proximity side part 74...Separated side part 76 ...Flow pipe 78...Switching valve 80...Exhaust pipe 82...Air supply pipe 84...Intake pump 86...Compressor D1, D2...Separation distance X...Virtual axis

Claims (10)

A casting device comprising a fixed mold and a movable mold that approaches or moves away from the fixed mold, the fixed mold and the movable mold forming a cavity for obtaining a cylinder block,
a bore forming core for forming a cylinder bore in the cylinder block;
a water jacket forming core that surrounds the bore forming core from the outer peripheral side and forms a water jacket around the cylinder bore;
an actuator that integrally displaces the bore forming core and the water jacket forming core in a direction toward or away from the cavity;
Disposed in a gap between the bore forming core and the water jacket forming core, dividing the gap into a proximal side portion that is close to the cavity and a remote side portion that is spaced apart from the cavity. a seal member;
a suction device that sucks gas from the proximal portion through a flow path formed in the bore forming core;
Equipped with
The bore forming core has a proximal part facing the proximal side part and always exposed from the molten metal in the cavity, a distal part facing the remote side part, and a direction from the proximal part toward the cavity. a bore forming part that protrudes and is buried in the molten metal in the cavity,
The flow path has a first opening formed on the outer surface of the proximal portion, and a second opening formed on the outer surface of the distal portion and connected to the suction device, and the first opening is , a casting device opening into the proximal portion of the gap . The casting apparatus according to claim 1, wherein the bore forming core is arranged such that a central axis of the bore forming core intersects with a vertical direction,
In a cross section of the bore forming core that is perpendicular to the central axis and includes the first opening, the first opening is located above a horizontal straight line passing through the central axis. . 3. The casting apparatus according to claim 1 , wherein the first opening is formed near the sealing member. The casting apparatus according to any one of claims 1 to 3 , further comprising a fluid supply machine that supplies blow fluid from the remote side part to the proximal side part via the flow path. The casting apparatus according to any one of claims 1 to 4 , wherein the first opening is formed in a side wall of the proximal portion, and the flow path extends from the inside of the bore forming core to the first opening. 1. The casting device includes a ramp toward one opening, the ramp being inclined in a direction from the distal portion side to the proximal portion side. The casting apparatus according to any one of claims 1 to 5 , comprising a plurality of the bore forming cores and the water jacket forming cores, and the adjacent bore forming cores have a V-shape. Casting equipment. 7. The casting apparatus according to claim 6 , wherein the adjacent bore forming cores are arranged vertically. 8. The casting apparatus according to claim 7 , wherein the distal part of the bore forming core has a larger diameter than the proximal part, and a lower part of the distal part has a diameter larger than that of the water jacket forming core. A casting device in which the upper portion is in contact with an inner wall and is spaced apart from the inner wall of the water jacket forming core, while the side wall of the proximal portion is spaced from the inner wall of the water jacket forming core over the entire circumference. 9. The casting apparatus according to claim 8 , wherein the distance between the lower part of the proximal part and the inner wall of the water jacket forming core is equal to the distance between the upper part of the proximal part and the inner wall of the water jacket forming core. Casting equipment smaller than distance. 10. The casting apparatus according to claim 9 , wherein the distance between the upper part of the proximal portion and the inner wall of the water jacket forming core is 50 μm or less.

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